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Question

A body of mass 5kg is thrown vertically up with velocity 20ms. What will be its momentum just before hitting the ground? Take upward direction as positive.



A
100 Kg m/s
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B
0 Kg m/s
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C
-100 Kg m/s
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D
-20 Kg m/s
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Solution

The correct option is C -100 Kg m/s

The velocity of the ball just before hitting the ground will be equal to the initial velocity of the ball but in a downwards direction.

Since upward direction is positive, the velocity of the object in the downward direction is negative.

Velocity V just before hitting the ground is 20ms

mass of the ball M=5Kg

Momentum P=MV
P=5×(20)=100Kgms


Physics

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